Search for chargino and neutralino production at root s=181-184 GeV at LEP

G Abbiendi,K Ackerstaff, G Alexander, J Allison,N Altekamp,K J Anderson, Scott Geoffrey Anderson, S Arcelli, S Asai,S F Ashby, D Axen,G Azuelos, A H Ball, E Barberio,R J Barlow, R Bartoldus,Batley,S Baumann,J Bechtluft,T Behnke,K W Bell,G Bella,A Bellerive, S Bentvelsen,Siegfried Bethke,S Betts,O Biebel,A Biguzzi,S D Bird, Blobel,I J Bloodworth,M Bobinski,P Bock,J Bohme, D Bonacorsi,M Boutemeur,S Braibant,P Brightthomas, L Brigliadori,R M Brown,H J Burckhart, C Burgard,R Burgin, P Capiluppi,R K Carnegie,A A Carter, Carter,C Y Chang, D G Charlton,D Chrisman,C Ciocca,Pel Clarke,E Clay,Ira S Cohen,J E Conboy,O C Cooke,C Couyoumtzelis,R L Coxe, M Cuffiani,S Dado,G M Dallavalle,R F Davis,S De Jong,L A Del Pozo,A De Roeck,K Desch,B Dienes, Dixit,J Dubbert,E Duchovni, G Duckeck,I P Duerdoth,Delbert J Eatough,P G Estabrooks, E Etzion,H Evans,F Fabbri,Marcello Fanti,A A Faust,F Fiedler,M Fierro, I Fleck,R Folman,A Furtjes, David Futyan,Pauline Gagnon,J W Gary,J Gascon,S M Gasconshotkin,G Gaycken,Ch Geichgimbel, G Giacomelli,P Giacomelli,Gibson,W R Gibson,D M Gingrich, D Glenzinski,Jack Goldberg,W Gorn,C Grandi, E Gross,J Grunhaus,M Gruwe,G G Hanson,M Hansroul,M Hapke, K Harder,C K Hargrove,C Hartmann,M Hauschild, C M Hawkes, Richard John Hawkings,R J Hemingway,M Herndon, G Herten,R D Heuer, M D Hildreth, J C Hill, S J Hillier,P R Hobson,A Hocker,R J Homer,A K Honma,D Horvath,K R Hossain,R Howard,P Huntemeyer,P Igokemenes,D C Imrie,K Ishii, F R Jacob, A Jawahery,H Jeremie,M Jimack,C R Jones,P Jovanovic, T R Junk,D Karlen, Kartvelishvili,K Kawagoe, T Kawamoto,P I Kayal,R Keeler,R G Kellogg, B W Kennedy, A Klier,S Kluth,T Kobayashi, M Kobel,D S Koetke,T P Kokott,M Kolrep,S Komamiya, R Kowalewski,T S Kress,P Krieger,J Von Krogh,T Kuhl,P Kyberd,G D Lafferty,D Lanske,J Lauber, Lautenschlager,I Lawson,J G Layter,D Lazic,A M Lee, D Lellouch, J Letts,L Levinson,R Liebisch,B List,C Littlewood,A W Lloyd, S L Lloyd,F K Loebinger,G D Long,M J Losty, J Ludwig,Dong Liu, A Macchiolo,A Macpherson, W F Mader, M Mannelli,S Marcellini,C Markopoulos, A Martin, J P Martin,German Martinez, T Mashimo, P Mattig,W J Mcdonald,J A Mckenna,E A Mckigney,T J Mcmahon,R A Mcpherson, F Meijers, S Menke, F S Merritt,H Mes,J Meyer,Aldo Michelini,S Mihara, G Mikenberg,D J Miller,R Mir, W Mohr,A Montanari,T Mori, K Nagai,I Nakamura, H A Neal,B Nellen, R Nisius,S W Oneale,F G Oakham,F Odorici, H Ogren, M J Oreglia,S Orito,J Palinkas,G Pasztor, Pater,G N Patrick,J Patt,R Perezochoa,S Petzold,P Pfeifenschneider, J E Pilcher, J L Pinfold,D E Plane,P Poffenberger,J Polok,M Przybycien, C Rembser,H Rick,S H Robertson,S A Robins,N Rodning,J M Roney,K Roscoe,A M Rossi, Y Rozen, K Runge,O Runolfsson, Rust,K Sachs,T Saeki,O Sahr,W M Sang,Ekg Sarkisyan,C Sbarra,A D Schaile,O Schaile,F Scharf,P Scharffhansen, J Schieck,B Schmitt,Sebastian Schmitt,A Schoning,M Schroder,Markus Schumacher, C Schwick, W G Scott, R Seuster,T Shears,B C Shen,C H Shepherdthemistocleous, P Sherwood,G P Siroli,A Sittler, A Skuja,A M Smith,G A Snow, R Sobie,S Soldnerrembold,M Sproston,Achim Stahl,K Stephens,J Steuerer,K Stoll,D Strom, R Strohmer,B Surrow,S D Talbot, Sho Tanaka,P Taras,S Tarem, R J Teuscher,M Thiergen,Mark Thomson,E Von Torne,E Torrence,S Towers,Isabel Marian Trigger,Zoltan Laszlo Trocsanyi,E Tsur,A S Turcot,M F Turnerwatson,R Van Kooten,P Vannerem,M Verzocchi,H Voss,F Wackerle, A Wagner, C P Ward,Ward,P M Watkins,A T Watson, N K Watson,P S Wells, N Wermes,J S White,G W Wilson, J A Wilson,T R Wyatt,Shinji Yamashita,G Yekutieli, Zacek,D Zerzion

EUROPEAN PHYSICAL JOURNAL C（1999）

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Abstract

A search for charginos and neutralinos, predicted by supersymmetric theories, has been performed using a data sample of 57 pb(-1) at centre-of-mass energies of 181-184 GeV taken with the OPAL detector at LEP. No evidence for chargino or neutralino production has been found. Upper limits on chargino and neutralino pair production (<(chi)over tilde>(+)(1)<(chi)over tilde>(-)(1)<(chi)over tilde>(0)(1)<(chi)over tilde>(0)(2)) cross-sections are obtained as a function of the chargino mass (m(<(chi)over tilde>1+/-)), the lightest neutralino mass (m(<(chi)over tilde>10)) and the second lightest neulralino mass (m(<(chi)over tilde>20)). For large chargino masses the limits have been improved with respect to the previous analyses at. lower centre-of-mass energies. Exclusion regions at 95% confidence level (C.L.) of parameters of the Constrained Minimal Supersymmetric Standard Model are determined for the case of a large universal scalar mass, mo, implying heavy scalar fermions, and for the case of a small mo resulting in light scaler fermions and giving the worst-case Limits. Within this framework and for m(<(chi)over tilde>1+/-) - m(<(chi)over tilde>10) greater than or equal to 5 GeV the 95% C.L. lower limits on m(<(chi)over tilde>1+/-) for m(0) = 500 GeV are 90.0 and 90.2 GeV for tan beta = 1.5 and 35 respectively. These limits for all m(0) (the worst-case) are 69.1 and 65.2 GeV for tan beta = 1.5 and 35 respectively. Exclusion regions are also presented for neutralino masses, including an absolute lower limit at 95% C.L. for the mass of the lightest neutralino of 30.1 GeV for m(0) = 500 GeV (25.2 GeV for all m(0)), with implications for experimental searches for the lightest neutralino as a dark matter candidate.

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Key words

leptons,decay

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